001/*
002 * Copyright 2002-2014 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.web.servlet.view.tiles3;
018
019import java.io.IOException;
020import java.net.URL;
021import java.util.ArrayList;
022import java.util.Collection;
023import java.util.Collections;
024import java.util.Locale;
025import javax.servlet.ServletContext;
026
027import org.apache.tiles.request.ApplicationResource;
028import org.apache.tiles.request.locale.URLApplicationResource;
029import org.apache.tiles.request.servlet.ServletApplicationContext;
030
031import org.springframework.core.io.Resource;
032import org.springframework.core.io.support.ResourcePatternResolver;
033import org.springframework.util.CollectionUtils;
034import org.springframework.util.ObjectUtils;
035import org.springframework.web.context.support.ServletContextResourcePatternResolver;
036
037/**
038 * Spring-specific subclass of the Tiles ServletApplicationContext.
039 *
040 * @author Rossen Stoyanchev
041 * @author Juergen Hoeller
042 * @since 3.2
043 */
044public class SpringWildcardServletTilesApplicationContext extends ServletApplicationContext {
045
046        private final ResourcePatternResolver resolver;
047
048
049        public SpringWildcardServletTilesApplicationContext(ServletContext servletContext) {
050                super(servletContext);
051                this.resolver = new ServletContextResourcePatternResolver(servletContext);
052        }
053
054
055        @Override
056        public ApplicationResource getResource(String localePath) {
057                Collection<ApplicationResource> urlSet = getResources(localePath);
058                if (!CollectionUtils.isEmpty(urlSet)) {
059                        return urlSet.iterator().next();
060                }
061                return null;
062        }
063
064        @Override
065        public ApplicationResource getResource(ApplicationResource base, Locale locale) {
066                Collection<ApplicationResource> urlSet = getResources(base.getLocalePath(locale));
067                if (!CollectionUtils.isEmpty(urlSet)) {
068                        return urlSet.iterator().next();
069                }
070                return null;
071        }
072
073        @Override
074        public Collection<ApplicationResource> getResources(String path) {
075                Resource[] resources;
076                try {
077                        resources = this.resolver.getResources(path);
078                }
079                catch (IOException ex) {
080                        ((ServletContext) getContext()).log("Resource retrieval failed for path: " + path, ex);
081                        return Collections.emptyList();
082                }
083                if (ObjectUtils.isEmpty(resources)) {
084                        ((ServletContext) getContext()).log("No resources found for path pattern: " + path);
085                        return Collections.emptyList();
086                }
087
088                Collection<ApplicationResource> resourceList = new ArrayList<ApplicationResource>(resources.length);
089                for (Resource resource : resources) {
090                        try {
091                                URL url = resource.getURL();
092                                resourceList.add(new URLApplicationResource(url.toExternalForm(), url));
093                        }
094                        catch (IOException ex) {
095                                // Shouldn't happen with the kind of resources we're using
096                                throw new IllegalArgumentException("No URL for " + resource, ex);
097                        }
098                }
099                return resourceList;
100        }
101
102}